Plane Source of Concentrated Magnetic Field Based on Square Coils

You can see the method of the synthesis of planar sources of concentrated magnetic field. Method defines the current distribution in the plane, which is required to produce a concentrated magnetic field at a distance from the source. Carried out a numerical calculation of the current distribution to create a point field localization. It is shown that the field concentration is achieved by minimizing the level of low spatial frequencies due to antiphase currents in concentric circular coils. The resulting field distribution is extremely sensitive to the slightest changes in the current distribution, which creates difficulties for the practical implementation of the system.